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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 718 · 40 sums
TalentJR

The method (Column by column): Line up ones, tens and hundreds. Add from the right; 10 or more → carry 1 to the next column. Subtract from the right; top digit smaller → borrow 1 from the next column. Missing number in an addition = total − the number you know.

NameDateTime takenScore ___ / 40
  1. 1.716 − 219 =
  2. 2.713 − 279 =
  3. 3.377 − ? = 149
  4. 4.875 + 104 =
  5. 5.? + 355 = 462
  6. 6.235 − ? = 16
  7. 7.468 + 522 =
  8. 8.502 − 345 =
  9. 9.A school has 307 children. 172 of them are girls. How many boys are there?
  10. 10.A school has 469 children. 280 of them are girls. How many boys are there?
  11. 11.? − 281 = 194
  12. 12.A train has 207 people in the front coaches and 763 people in the back coaches. How many people are on the train?
  13. 13.A train has 429 people in the front coaches and 196 people in the back coaches. How many people are on the train?
  14. 14.587 + 189 =
  15. 15.A train has 861 people in the front coaches and 112 people in the back coaches. How many people are on the train?
  16. 16.519 + 294 =
  17. 17.435 − ? = 59
  18. 18.A train has 347 people in the front coaches and 289 people in the back coaches. How many people are on the train?
  19. 19.? + 839 = 947
  20. 20.194 + ? = 850
  21. 21.201 + 730 =
  22. 22.383 + ? = 913
  23. 23.A school has 805 children. 744 of them are girls. How many boys are there?
  24. 24.A school has 379 children. 138 of them are girls. How many boys are there?
  25. 25.789 + 150 =
  26. 26.? + 201 = 405
  27. 27.A train has 341 people in the front coaches and 114 people in the back coaches. How many people are on the train?
  28. 28.530 + 349 =
  29. 29.674 + 152 =
  30. 30.A train has 127 people in the front coaches and 471 people in the back coaches. How many people are on the train?
  31. 31.A school has 429 children. 420 of them are girls. How many boys are there?
  32. 32.? + 387 = 774
  33. 33.772 + ? = 920
  34. 34.230 − 228 =
  35. 35.365 − 295 =
  36. 36.A train has 538 people in the front coaches and 419 people in the back coaches. How many people are on the train?
  37. 37.607 + 349 =
  38. 38.736 − 356 =
  39. 39.579 − 114 =
  40. 40.203 + ? = 509

Answer key

  1. 497
  2. 434
  3. 228
  4. 979
  5. 107
  6. 219
  7. 990
  8. 157
  9. 135
  10. 189
  11. 475
  12. 970
  13. 625
  14. 776
  15. 973
  16. 813
  17. 376
  18. 636
  19. 108
  20. 656
  21. 931
  22. 530
  23. 61
  24. 241
  25. 939
  26. 204
  27. 455
  28. 879
  29. 826
  30. 598
  31. 9
  32. 387
  33. 148
  34. 2
  35. 70
  36. 957
  37. 956
  38. 380
  39. 465
  40. 306

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